TECHNICAL FIELD

The object of the present invention is an easily openable pull-off beverage bottle closure.

BACKGROUND ART

Currently the easily openable closures (most often the crown caps pull- off type) available on the market include a pull tab (a pull-ring) connected with the closure shell. The closure shell is made of metal alloys, most often of aluminum alloys or steel alloys. The pull-ring may be metal of may be made of plastic. On the closure shell there are two non-visible score lines.

When tom the pull tab is pulled upwards, in order to tear the part between two invisible score lines on the shell from the remaining part of the closure, and then to open the bottle. The inner part of the closure shell is covered with a liner made of plastic, which fills the space between the bottle and the upper part of the shell. Such solution is, for instance, known from patent specification EP1621475B1.

Patent specification WO2015025737 discloses a solution referring to an easily openable container closure, where the closure includes a shell and a liner (a seal) mounted to the inner surface of the upper part of the shell, and the shell has a pair of score lines. The liner is thinner in the central section, and thicker in the peripheral edge section. The liner is placed between the score lines, in such a way that its peripheral edge extends along the score lines.

So far the inventors focused on facilitation of opening of the closures, or improvement of their integrity. No one considered improvement of safety of those type closures. However after opening of the bottle and separation of the part of the shell between the score lines from its body, the torn part of the shell has sharp edges that can hurt the person opening the bottle. Unexpectedly, it was found that it is possible to secure the sharp edges of the shell with the use of relatively simple means.

DISCLOSURE OF THE INVENTION

An easily openable pull-off beverage bottle closure consisting of a shell, a pull tab and a liner covering the inner section of the shell providing circumferential sealing, where the shell has upper closing plane and a skirt wall shaped from the outer part of the upper part of the closing plane, and the pull tab is connected with the skirt wall, where the shell has score lines running on the both sides of the pull tab from the skirt wall through the upper plane enabling to tear off the closure in accordance with the invention is characterised by this that the liner is affixed to the inner upper section of the closing plane and it covers the surface bigger than the surface limited by the score lines running through the upper plane of the shell. The liner is affixed with the use of a coating increasing the adhesion. The term“the coating increasing the adhesion” shall be understood as a coating applied to the inner surface of the shell upper panel (plane) in order to enable connection of the metal sheet, of which the shell is made, with the plastic, of which the liner is made, in particular a coating obtained by application of lacquer or glue or another substance known from the state of the art or by increasing the adhesion of the metal sheet in another way known from the state of the art e.g. by treatment with gas plasma.

The distance from the score line to the outer edge of the liner is from 0,05 to 1,2 mm. As a result the diameter of the liner is bigger than the maximal diameter of the torn part of the shell limited by the score lines. Sharp edges of the shell formed after pulling the pull tab upwards and tearing the score lines on the shell are secured by the liner. The liner is affixed to the inner surface of the shell strongly enough, that after the pull tab is pulled upwards, the whole liner together with the tom part of the shell goes upwards and does not stay on the bottle.

The coating increasing the adhesion, which affixes the liner to the inner surface of the closing plane, is situated in the in the distance of at least 0,1 mm from the score line measured on the inner surface of the shell in the radial direction to the skirt wall and in the distance of at least 1,5 mm measured on the inner surface of the shell in the radial direction to the upper closing plane .

The ratio of the distance from the score line to the outer edge of the liner to the height of the liner is from 0,02 to 1. It ensures, that the opening is easy, on condition that after the pull tab is pulled upwards the liner together with the tom part of the shell goes upwards not staying on the bottle.

The subject of the invention is disclosed at the drawings.

EXAMPLE

The pull-off beverage bottle closure, where the shell is made of metal alloy, consists of the upper closing plane 1 and skirt wall 2. The liner 3 is affixed to the inner surface of the closing plane 1 of a coating increasing the adhesion and provides circumferential sealing. The score lines 4 on the closing plane 1 and the skirt wall 2 enable tearing of the closure with the pull tab 5. The distance A from the score line 4 to the outer edge of the liner 3 is from 0,05 to 1,2 mm. The coating increasing the adhesion, which affixes the liner 3 to the inner surface of the upper closing plane 1, is in the distance C of at least 0,1 mm from the score line 4 measured on the inner surface of the shell in the radial direction to the skirt wall 2 and in the distance D of at least 1,5 mm measured on the inner surface of the shell in the radial direction to the upper closing plane 1. The ratio of the distance A from the score line 4 to the outer edge of the liner 3 to the height of the liner E is from 0,02 to 1.

After pulling the pull tab 5 the score lines 4 are torn and the part of the closing plane 1 and the part of the skirt wall 2 are pulled upwards. The liner 3 going upwards covers the sharp edges formed after tearing the score lines 4.